Fig. 5 X-ray diffractograms of the precipitates formed at 1 M NH4H2PO4, pH 4.0, an Fe/Al molar ratio of 1.2, and different Al concentrations: (a) Fe(II),
, (b) Fe(II),
, (c) Fe(III),
, and (d) Fe(III),
. The aging period was 3 wk at 23°C
Fig. 5 X-ray diffractograms of the precipitates formed at 1 M NH4H2PO4, pH 4.0, an Fe/Al molar ratio of 1.2, and different Al concentrations: (a) Fe(II),
, (b) Fe(II),
, (c) Fe(III),
, and (d) Fe(III),
. The aging period was 3 wk at 23°C